YES on Top AI model on Jun 13 (LMArena): claude-opus-4-6-thinking

Opus 4.8 took ~8 days from release (May 28) to Arena listing (Jun 5 board), and Anthropic's last two flagships debuted BELOW opus-4-6-thinking's 1504 (4-8-thinking: 1482). Fable released Jun 9; resolution is Jun 13 10AM ET. Cleanest tail risk: Fable 5 was already accumulating Arena votes under a codename and is revealed at #1 in the next refresh.